Make sure that your stereo receiver is not paired to another Bluetooth device.

Make sure that your Bluetooth device is not paired to another Bluetooth device.

Make sure that you select Bluetooth audio as your stereo receiver’s input (source). Press INPUT on the stereo receiver repeatedly until “BT AUDIO” is shown on the display or press (BLUETOOTH) on your remote control.

Make sure that you have entered pairing mode on your Bluetooth device. See the documentation that came with your Bluetooth device for more information.

Make sure that you selected NS-STR514 from the list of available Bluetooth devices.